Disposable dust bags



Oct. 20, 1959 INVENTOR. BYM AM G. E. LOFGREN DISPOSABLE DUST BAGS FlledJune 10, 1958 United States Patent .0

DISPOSABLE DUST BAGS Gustaf E. Lofgren, Riverside, Conn., assignor toElectrolux Corporation, Old Greenwich, Conn., a corporation of DelawareApplication June 10, 1958, Serial No. 741,069

2 Claims. (Cl. 183-51) My invention relates to flexible containers andmore specifically to disposable paper dust bags for use with vacuumcleaners.

The object of my invention is to provide an improved closure for the endof such a bag. Heretofore it has been the practice to fold over the endin a double fold in order to effect a dust tight closure. However, Ihave discovered that an improved closure may be obtained by introducingadhesive into the open end of the bag, applying a piece of tape alongthe open end and then folding over this end in a single fold. Thisresults in a substantial saving in the amount of paper required to makea bag of given finished size and it also results in a less bulkyconstruction, which is of advantage when packing bags for shipment.

Further objects and advantages of my invention will be apparent from thefollowing description when considered in connection with theaccompanying drawings which form a part of this specification and ofwhich;

Fig. l is a top view of a dust bag in accordance with my invention;

Fig. 2 is a side view of the bag shown in Fig. 1;

Fig. 3 is a cross-sectional view taken on the line 3-3 of Fig. 1;

Fig. 4 is a view similar to Fig. 3, but showing the bag before the endis folded over; and

Fig. 5 is a cross-sectional view taken on the line 5--5 of Fig. 4, butwith the walls slightly separated for the sake of clarity.

Referring to the drawings, reference character designates generally abag portion of a flexible disposable dust container. The bag 10comprises a front wall 12, a rear wall 14, and side walls 16 and 18,which walls are preferably made of a single sheet of paper with itsopposite edges glued together, as is customary with paper bags. At theright-hand end, as viewed in Figs. 1 and 2, the walls are folded so asto provide a rectangular end wall 20 to which may be attached acardboard disc 22 formed with a central aperture 24. The end wall 20 isformed with an opening in alignment with aperture 24, constituting theinlet into the bag.

The paper constituting bag 10 is porous so as to permit the passagetherethrough of air, but not of dust and other solid particles picked upby the vacuum cleaner. Preferably the bag is provided with a liner 26 offibrous sheet material which has a greater porosity and a greaterthickness than the paper constituting the bag 10. While this liner 26 isshown in the drawings as a single layer, it may advantageously be madeof several plies. The advantages of a lined bag of this nature are fullyset forth in Patent No. 2,804,166 issued August 27, 1957 to myself,Henry W. Stevens, Raymond L. Brown and Arnold H. Beede.

As is shown more particularly in Fig. 5, the side walls 16 and 18together with the corresponding portions of the liner 26 are folded soas to lie flat between the front Paizehtecl- Oct. 20, 1959 H 2 wall.12and the back wall 14. During the fabrication of the dust bag, adhesivedesignated by reference character 28 in Fig. 5' is applied to the innersurfaces of the front, back and side walls adjacent to the end of thebag opposite to the end to which the disc 22 is attached. This adhesiveimpregnates and penetrates through the porous liner 26 and contacts theinner surfaces of the outer walls. Thereafter, a strip of paper tape 30,one side of which has been coated with adhesive, is folded over andapplied to the end of the bag, as shown in Fig. 4. The adhesive 28within the bag serves to secure the front, back and side Walls togetherat this end of the 'bag so as to form a dust tight closure. The tapeglued around the end of the bag as above described, serves primarily toadd mechanical strength to the glued joint between the inner faces ofthe wall, and particularly to prevent opening of the joint by peelingwhen the bag is inflated during use.

After the tape has been afiixed as shown in Fig. 4, a glue line 32 isapplied across either the front wall 12 or the rear wall 14 of the bagadjacent to the edge of the tape. As illustrated in Fig. 4, the glue isapplied to the front wall 12, and the end is folded over as shown inFig. 3 so that an outer surface of the tape comes in contact with theglue line to retain the end in folded condition. This further reinforcesthe closure and enables it to better resist rupture when the bag isinflated during use.

Elimination of the second fold over in accordance with my inventionsaves about one-half inch of both paper and liner which amounts toapproximately 5% of these materials required to make a bag. While itnecessitates the additional strip of tape 30, the paper of which this ismade is considerably cheaper than the porous paper used for the bag 10and the fibrous sheet material used for the liner 26. Furthermore, anadditional fold over would increase the thickness of the bag at theclosed end by 50% which is substantially greater than the thickness ofthe two folds of the tape 30. In accordance with the present inventionthe thickness of this closed end of the bag is no greater than thethickness of the bag and disc 22 at the other end, whereas with a doublefolded end the maximum thickness would occur at the folded end. It isadvantageous to maintain the maximum thickness of the bag as small aspossible in order to conserve space in packing the bags for shipment.

While I have shown and described one more or less specific embodiment ofmy invention, this has been done for the purpose of illustration onlyand that the scope of my invention is not to be limited thereby, but itis to be determined from the appended claims.

What I claim is:

1. A disposable dust container comprising a bag of porous paper havingfront, back and side walls folded to lie flat in parallel planes, anadhesive on the inner surfaces of said walls adjacent to one end of thebag for securing said walls together in dust tight relationship, a stripof tape folded over said end of the bag, adhesive between the innersurface of said tape and the outer surfaces of said front and back Wallsto secure said tape thereto, said walls being folded over adjacent tosaid piece of tape, and adhesive between the outer surface of said tapeand the outer surface of said front wall to maintain the walls in foldedcondition.-

2. A disposable dust container comprising a bag of porous paper havingfront, back and side walls folded to lie flat in parallel planes, aliner of fibrous sheet material within said bag, adhesive impregnatingsaid liner adjacent to one end of the bag and contacting the innersurfaces of said walls for securing the walls and References Cited inthe file of this patent UNITED STATES PATENTS Bartlett May 21, 1912Brace Oct. 4, 1955 Randall Mar. 13, 1956 Brace Feb. 12, 1957 Stevens etal Aug. 27, 1957

